| Abstract: | A rich literature shows that early life conditions shape later life outcomes, 
including health and migration events. However, analyses of geographic 
disparities in mortality outcomes focus almost exclusively on 
contemporaneously measured geographic place (e.g., state of residence at 
death), thereby potentially conflating the role of early life conditions, 
migration patterns, and effects of destinations. We use the newly available 
Mortality Disparities in American Communities (MDAC) dataset, which links 
respondents in the 2008 ACS to official death records and estimate 
consequential differences by method of aggregation; the mean absolute 
deviation of the difference in life expectancy at age 50 measured by state of 
birth versus state of residence is 0.58 (0.50) years for men and 0.40 (0.29) 
years for women. These differences are also spatially clustered, and we show 
that regional inequality in life expectancy is higher based on life 
expectancies by state of birth, implying that interstate migration mitigates 
baseline geographical inequality in mortality outcomes. Finally, we assess how 
state-specific features of in-migration, out-migration, and non-migration 
together shape measures of mortality disparities by state (of residence), 
further demonstrating the difficulty of clearly interpreting these widely used 
measures. |